My setup is very simple. My Roon core is running on a latest generation NUC, which is also my end-point, with a direct USB connection into the Pontus II. My music library is on a Synology NAS on the same gigabit Ethernet switch, mounted to the NUC. I use three different Roon controllers (iPad, iPhone, MacOS Client). My network switch, NAS, NUC, etc are all within 2 meters of each other and on high quality, short Ethernet cables.
I’ve experienced the static twice, first time was about a week ago, and today was the second time. In both cases, I had left my DAC on for several days straight without placing it into standby mode at all. The static was very pronounced and was only present when music was playing (if there was a natural pause in the music, or if I paused Roon playback, the static stops).
I rebooted my NUC (so that’s the entire Roon system - since its all collapsed into one machine) and once it came back up, I continued playing music where I left off and the static continued to be present.
I then cycled the power on my integrated, and the static continued, same as before.
I then unplugged my NUC from the DAC by removing the USB cable, plugged it back in, started play back again (Roon pauses automatically once the USB device [the DAC] is removed) and the static continued, unchanged.
I then put the DAC into standby mode (I did not unplug the power connector, I just pressed the standby button) - left it in standby for about one second, then took the DAC off standby, and the static went away immediately.
I’m leaving my DAC on nonstop now and will see how many days it takes again for this issue to resurface. I’ve submitted this with Denafrips online to see if they have any advice.
Since I rebooted my entire Roon system and have the most basic Roon setup possible (all running on a NUC with a direct USB connection to the DAC), and since the problem goes away after putting the DAC into standby mode, I feel the issue is likely due to a flaw in the DAC. It is possible a firmware update might be needed, or there could be a defective part that fails after a certain amount of time and is reset after the DAC goes into standby mode. For instance, if there is a drifting clock or a buffer that fills up the noise could be present from a certain point onward until its reset with the standby switch.
With your system, I think a really good next step would be to do the same as me and do a power cycle now, then record the date/time and do not power off or put the Denafrips into standby mode again - we can see if it fails after a certain amount of time comparable to mine.
I installed this DAC brand new on 23 March, and this issue has happened twice already. I think its been about a week since the last time. I will be taking good notes on this from here out.
Hope this all helps… Will continue to update here in this thread.